diff --git a/library/core/src/cell/once.rs b/library/core/src/cell/once.rs
index 6c71e2216a71b..af4469fad2cc6 100644
--- a/library/core/src/cell/once.rs
+++ b/library/core/src/cell/once.rs
@@ -353,7 +353,8 @@ impl<T> OnceCell<T> {
 }
 
 #[stable(feature = "once_cell", since = "1.70.0")]
-impl<T> Default for OnceCell<T> {
+#[rustc_const_unstable(feature = "const_default", issue = "143894")]
+impl<T> const Default for OnceCell<T> {
     #[inline]
     fn default() -> Self {
         Self::new()
diff --git a/library/std/src/lib.rs b/library/std/src/lib.rs
index 0401e9b39ff49..65ea85f36d931 100644
--- a/library/std/src/lib.rs
+++ b/library/std/src/lib.rs
@@ -274,6 +274,7 @@
 #![feature(cfg_sanitizer_cfi)]
 #![feature(cfg_target_thread_local)]
 #![feature(cfi_encoding)]
+#![feature(const_default)]
 #![feature(const_trait_impl)]
 #![feature(core_float_math)]
 #![feature(decl_macro)]
diff --git a/library/std/src/sync/once_lock.rs b/library/std/src/sync/once_lock.rs
index d1bbe0ff843cf..b9a7077e420e6 100644
--- a/library/std/src/sync/once_lock.rs
+++ b/library/std/src/sync/once_lock.rs
@@ -582,7 +582,8 @@ impl<T: RefUnwindSafe + UnwindSafe> RefUnwindSafe for OnceLock<T> {}
 impl<T: UnwindSafe> UnwindSafe for OnceLock<T> {}
 
 #[stable(feature = "once_cell", since = "1.70.0")]
-impl<T> Default for OnceLock<T> {
+#[rustc_const_unstable(feature = "const_default", issue = "143894")]
+impl<T> const Default for OnceLock<T> {
     /// Creates a new uninitialized cell.
     ///
     /// # Example